I have not started on my mock up yet, but im almost in the same boat, i was debating buying 2 erogtronic stands which range from 150 to 250, which is way to much for what i need, and then i ahve seen other peopels setup going to home depo and spending 50 to 70 bucks and not even that much half the time, buying some good peices of wood, already pre-beveled and then building your own stands that go vertical.

Thats what i will mostly likely be doing myself, well actually ill be ahving one of the guys in my office do it for me since he is better that that kind of things.

Im using a 22in center and 4 19" acer wide screens the sides, 2 on each, so im having him build 2 stands that can support there own weight Plus 2 monitors without falling foward, and hes also helping me build a swing arm for my slave PCs keyboard and mouses that i can swing out of the way when i dont need them.